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Mishimoto Racing Thermostat (87-06 2.5L, 4.0L or 4.2L Jeep Wrangler YJ & TJ)

Item J114556
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Market Price $26.40 You Save 5% ($1.45)
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$24.95 (each)

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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Racing Thermostat
      • Opening Temperature 180 Degrees
      • Standard Flow Rating
      • Run a Cooler Engine
      • Ideal for Modified Wranglers
      • Copper/Stainless Steel Construction
      • Easy Installation
      • No Questions Asked Warranty
      • Fits 1987-2006 2.5L, 4.0L and 4.2L YJ and TJ Jeep Wranglers


      Cool Your Wrangler Down. The Mishimoto Racing Thermostat provides more efficient cooling throughout your Wrangler's engine allowing it to run cooler and making it ideal for modified Wranglers.

      Open Low for High Performance. With a standard flow rating, the Mishimoto thermostat opens up at 180° Fahrenheit, 10° lower than the standard factory thermostat temperature (190° Fahrenheit) This lets the coolant enter the engine block quicker and a cooler engine temperatures means more power, and it's copper and stainless steel construction means it will keep cooling for miles and miles.

      Easy Installation. The thermostat requires basic to moderate mechanical skill to be properly installed. Complete instructions are included.

      Limited Lifetime Warranty. This racing thermostat is covered under Mishimoto's 'no questions asked' limited lifetime warranty. Regardless of the defect Mishimoto will replace it. Please see complete warranty for details.

      Application. The Mishimoto Racing Thermostat is compatible with 1987-2006 2.5L, 4.0L and 4.2L Jeep Wrangler YJ and TJ.

      Fitment: 1987 1988 1989 1990 1991 1992 1993 1994 1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 Details

      MPN# MMTS-WRA-87L

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (5)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 5 customers

      • March 05, 2020

        5 1993 Wrangler - Thebigdeal

        Great Thermostat

        Installed this thermostat and it worked exactly as advertised.

        Helpful (0)
      • September 09, 2019

        3 2003 Wrangler - Denis

        Shipping takes a long time

        Installation was easy, everything fit like it should. Only negative experience is the time it took to deliver. The item was shipped more than a week after the purchase.

        Helpful (0)
      • September 04, 2019

        5 2003 Wrangler - Jeepgrl1991

        Huge difference!

        It took me about 45 minutes to install the thermostat but only because I’m picky and cleaned the thermostat housing since I was there already. Part was extremely easy to install, just two basic tools. Took it out for a ride two days after and noticed a huge difference, it dropped a total of 10 degrees. I also, bought the blue mishimoto hoses which compliment my Jeep well.

        Helpful (0)
      • July 15, 2019

        5 2004 Wrangler Unlimited - Chris

        Thermostat Mishimoto

        Very good product again I’m very happy with the purchase and would highly recommend this to everyone

        Helpful (1)
      • September 15, 2018

        5 2006 Rubicon - TomMostlyGerman

        Noticed Difference Right Away

        Just had this thermostat installed today. I could tell the difference right away. It drives like a new oil change but the oil wasn't changed. Can't wait to try it on the trail.

        Helpful (13)

      Questions & Answers (2 answers)

      2 Top Rated Questions

      I may be blind here but I didn’t see a tempature rating on this thermostat! 160-180-195 degree?

      • The Mishimoto thermostat opens up at 180° Fahrenheit, 10° lower than the standard factory thermostat temperature.

      Helpful (0)

      Do you carry the gasket for this thermostat if so what is the part#?

      • We do not have a replacement gasket for installation. We recommend contact Mishimoto or Mopar.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Thermostat
      • (1) Instructions

      Will It Fit My Wrangler

      • TJ Rubicon 2 Door - 03, 04, 05, 06
      • TJ Rubicon Unlimited 2 Door - 05, 06
      • TJ Wrangler 2 Door - 97, 98, 99, 00, 01, 02, 03, 04, 05, 06
      • TJ Wrangler Unlimited 2 Door - 04, 05, 06
      • YJ Wrangler 2 Door - 87, 88, 89, 90, 91, 92, 93, 94, 95

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